They should at least do a mission when there's no meteorite shower, as a background to measure against. Seawater is chock full of diatoms, so to me the hypothesis that hurricanes lift them up into the atmosphere seems a lot more likely than that they're raining down from space. Which is not to say that it's impossible, and if they want to do more research I'd say let them, but it's definitely way too early to be drawing conclusions.

_________________Say, can you feel the thunder in the air? Just like the moment ’fore it hits – then it’s everywhereWhat is this spell we’re under, do you care? The might to rise above it is now within your sphereMachinae Supremacy – Sid Icarus